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A method for increasing the steel drawing speed in the continuous casting process of thin steel slabs

A thin slab continuous casting, speed technology, applied in the field of iron and steel metallurgy

Active Publication Date: 2020-03-31
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, and to provide a method to solve the problem that the current thin slab casting speed is slow and it is difficult to stably produce thin-gauge hot-rolled strip steel. The method of drawing steel speed

Method used

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  • A method for increasing the steel drawing speed in the continuous casting process of thin steel slabs
  • A method for increasing the steel drawing speed in the continuous casting process of thin steel slabs

Examples

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Embodiment 1

[0030] A method for increasing the steel drawing speed during continuous casting of steel thin slabs, the schematic diagram of the thin slab continuous casting process equipment adopted is as follows figure 1 As shown, it includes stopper rod 1, tundish 2, submerged nozzle 3, crystallizer 4, first set of reduction devices R1, second set of reduction devices R2, secondary cooling 1~2 section A, secondary cooling 3~8 Section B, tension straightening device 5, coal oxygen lance 6, cutting device 7, specifically includes the following steps:

[0031] (1) The billet material is Q195 steel;

[0032] (2) After the ladle enters the position of the turntable, the stopper rod 1 is opened, the molten steel enters the mold 4 of the casting machine after being stored in the tundish 2 and begins to solidify into a slab. The thickness of the slab is 150mm. In this process, the casting machine uses a large arc Shaped radius design, the radius is 6.25m, using the extended mold 4, the effective len...

Embodiment 2

[0037] A method for increasing the steel drawing speed during the continuous casting of steel thin slabs. The thin slab continuous casting process equipment adopted is the same as that in Example 1, and specifically includes the following steps:

[0038] (1) The billet material is Q235B steel;

[0039] (2) After the ladle enters the position of the turntable, the stopper is opened, the molten steel enters the mold of the casting machine through the tundish to solidify into a slab, and the thickness of the slab is 100mm. In this process, the casting machine adopts a large arc radius design , With a radius of 6.25m, an extended mold is used, the effective length of the mold reaches 1.35m, and a coal oxygen lance device is added to the caster. The flame directly heats the corners of the continuous casting billet to raise the temperature of the corners and edges by more than 120℃ , The arrangement is that four simple coal oxygen lances are arranged in front of the tension leveling devi...

Embodiment 3

[0044] A method for increasing the steel drawing speed during the continuous casting of steel thin slabs. The thin slab continuous casting process equipment adopted is the same as that in Example 1, and specifically includes the following steps:

[0045] (1) The billet material is Q195 steel;

[0046] (2) After the ladle enters the position of the turntable, the stopper is opened, the molten steel enters the mold of the casting machine through the tundish and begins to solidify into a slab. The thickness of the slab is 50mm. In this process, the casting machine adopts a large arc radius design , With a radius of 6.25m, the use of an extended mold, the effective length of the mold reaches 1.35m, and an oxygen lance device is added to the caster. The flame directly heats the corners of the continuous casting billet to increase the temperature of the corners and edges by 150℃. The arrangement is that four simple coal oxygen lances are arranged in front of the tension leveling device, ...

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Abstract

The present invention is a method for increasing the steel drawing speed in the continuous casting process of steel thin slabs. The arc radius of the casting machine is 6.25m, the layout of the roller rows of the casting machine is adjusted, and the multi-section liquid core in the long section of the casting machine is greatly reduced and the crystallization is lengthened. The machine is equipped with two sets of pressing devices to realize the pressing of 5-25mm cast slab with liquid core; the specific process is: after the molten steel enters the crystallizer through the tundish, it begins to form a solidified shell. After passing through the crystallizer and the secondary cooling section, the solidified shell The thickness is 50~150mm, which increases the pulling speed. After the head of the billet is combined with the dummy rod, it starts to be pulled out. While increasing the pulling speed, the coal oxygen gun is ignited and the position and air flow are adjusted. The flame directly heats the continuous casting billet. Corner, raise the temperature of the corners and edges by 100~150℃. When the casting machine's pulling speed gradually stabilizes to 2~3mm / min, two sets of reduction devices are put in successively. After the swing shearing, the casting machine's pulling speed continues Increase to 4~8.5m / min. The technical solution of the present invention not only improves the quality of the slab, but also increases the steel drawing speed to 4-8.5m / min.

Description

Technical field: [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a method for increasing the steel drawing speed during continuous casting of steel thin slabs. Background technique: [0002] Thin slab continuous casting and rolling is a cutting-edge thin strip production technology in the steel industry. Compared with traditional thick slab continuous casting, thin slab continuous casting and rolling has the advantages of compact process, energy saving and high efficiency. Since the 1980s, thin slab continuous casting and rolling has developed rapidly, and significant progress has been made in product variety development, process technology and product quality control. [0003] At present, there are more than ten thin slab continuous casting and rolling production lines in major steel plants in my country. This production line mainly produces silicon steel, high carbon steel, weathering steel, plain carbon steel and oth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/12B22D11/16B22D11/22
CPCB22D11/1206B22D11/16B22D11/225
Inventor 袁国韩斌李振垒张元祥曾建立宋祖兴康健贾志鑫王国栋
Owner NORTHEASTERN UNIV LIAONING